Luteinizing hormone, testosterone and total estrogens response to exogenous GnRH in crossbred bulls with differing semen quality

Kumar, B.S. Bharath; Pandita, Sujata; Prakash, B.S.; Mallick, Smrutirekha; Mohanty, T.K.; Mandal, D. K.; Mili, Bhabesh

doi:10.1016/j.livsci.2015.01.019

Cited by 3 publications

(3 citation statements)

References 25 publications

(26 reference statements)

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“…The concentration of the metabolic hormones and growth factors vary with the body weight and growth (Verde and Trenkle 1987 ); this may be the reason for significant differences in the pre-treatment and post-treatment concentrations of testosterone between the bull calves of three different age groups in the present study and for lower magnitudes than the HF bull calves as observed by Mongkonpunya et al ( 1975 ). The total estrogen levels did not differ after administration of exogenous GnRH in all the groups, which agreed with a similar study carried out on adult HF × Tharparkar bulls (Bharath Kumar et al 2015 ). We did not find any significant difference in the peak concentrations and area under response curve of total estrogens and time taken to attain peak levels between the groups.…”

Section: Discussionsupporting

confidence: 92%

Responsiveness of prepubertal crossbred bull calves to exogenous GnRH and its impact on reproductive hormones under tropical conditions

Kumar

Pandita

Prakash³

et al. 2016

SpringerPlus

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This study investigated the age related variations in luteinizing hormone (LH), androstenedione, testosterone, and total estrogens response to exogenous gonadotropin-releasing hormone (GnRH) in Holstein–Friesian (HF) × Tharparkar bull calves. Fifteen bull calves were selected and, based on their age, were divided into Group I (14–16 months, n = 5), Group II (9–12 months, n = 5), and Group III (6–8 months, n = 5). All bull calves were administered with 10 µg of GnRH intramuscularly. Blood samples were collected at an interval of 30 min commencing 1 h prior to GnRH treatment until 4 h post-GnRH treatment and thereafter, at an interval of 1 h for the next 3 h. Endocrine response in terms of pretreatment values, peak values, area under curve, and time taken to attain peak values for LH, androstenedione, testosterone, and total estrogens was evaluated in all the bull calves. Significant differences were observed in pretreatment values, peak concentrations, and area under curve for androstenedione and testosterone between the groups; with response being higher in Group I bull calves. The results indicated that the HF × Tharparkar bull calves of 14 months age and above respond to exogenous GnRH by secreting significant amounts of testosterone.

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Section: Discussionsupporting

confidence: 92%

Responsiveness of prepubertal crossbred bull calves to exogenous GnRH and its impact on reproductive hormones under tropical conditions

Kumar

Pandita

Prakash³

et al. 2016

SpringerPlus

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“…Pituitary and testicular response to exogenous gonadotropin-releasing hormone (GnRH) was used as one of the methods for segregating bulls with respect to fertility (Post et al, 1987;Devkota et al, 2011). However, contradictory reports have also been recorded claiming that GnRH test has no relation with semen production (Abdel-Malak and Thibier, 1982), semen parameters (Gabor et al, 1995;Bharath Kumar et al, 2015), and libido (Byerley, 1990). Berndtson et al (1987) observed a significant correlation between daily sperm production and total Sertoli cells (P < 0.05, r = 0.83), and Sertoli cells per gram (P < 0.01, r = 0.47) in Holstein Friesian bulls.…”

Section: Segregation Of Fertile From Sub-fertile Bull Calves Early In Lifementioning

confidence: 99%

Regulation of postnatal development of testes and its association with puberty and fertility -A review

Kumar

Pandita

Sharma

et al. 2015

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Indigenous bull breeds attain puberty late in life when compared to the breeds of <italic>Bos taurus</italic>. Cross breeding between <italic>Bos taurus</italic> and <italic>Bos indicus</italic> has decreased the age at puberty and increased the total semen production period of bulls. However, some of the drawbacks like impaired semen production, poor libido, and low freezability are common among the crossbred bulls in India. Leydig and Sertoli cells are the most important non–germinal cells of testes that are essential for sperm production. The development and differentiation of these testicular cells occurs during postnatal period in bull calves and are dependent on the transient rise in gonadotropins, insulin–like growth factor 1 (IGF–1), and other growth factors. Administration of gonadotropins or gonadotropin–releasing hormone (GnRH) before the transient rise initiates the multiplication of Leydig and Sertoli cells, and results in hastened onset of sexual maturity, increased testicular weight, sperm output, and number of germ cells. Supplementation of high–energy diet during the period of 2–6 months is essential as it increases the IGF–1 release that further acts to release GnRH and development of testicular non–germinal cells. This review highlights some of the developments made with respect to regulation of postnatal development of testes, early detection of fertility, and ways to augment the sperm production capacity.

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“…In some cases, certain animals constantly have a high libido and good semen quality for evaluation, freezing or insemination, while others are reluctant for collection and have low quality ejaculates with decreased volume and concentration or other inadequate spermatological characteristics [2][3][4] . During the  İletişim (Correspondence)  +90 312 3170315/4409  ergakcay@gmail.com last decades, specific hormones (oxytocin, prostaglandins, testosterone and GnRH) were introduced to increase the sperm output, quality of male-related reproductive deficiencies and to regulate the breeding activity [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Oksitosin ve PGF2α Enjeksiyonlarının Teke Sperma Kalitesi Üzerine Etkisi

Şen¹,

Tekin²,

Çil³

et al. 2019

Kafkas Univ Vet Fak Derg

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The aim of the present study was to evaluate the effects of exogenous oxytocin and PGF2α on seminal quality and libido sexualis in bucks. To investigate the role of these hormones on male fertility, semen samples from 20 Norduz bucks (3-4 years of age) were collected with an artificial vagina twice a week with five replications in breeding season. Bucks were randomly assigned to five groups, control group was administered with 2 mL of sodium chloride, 0.9% (w/v)) i.m., whilst the experimental groups were administered with oxytocin 10 IU, i.v. (Group 1, n = 5), oxytocin 20 IU, i.v. (Group 2, n = 5), PGF2α 5 mg, i.m. (Group 3, n = 5) or PGF2α 10 mg, i.m. (Group 4, n = 5) 20 min before each collection. There was no statistical difference between the treatment groups in terms of motility (P>0.05). However, semen volume, concentration, abnormal spermatozoa rate, intact membrane rate and libido results were statistically significant among the different groups (P<0.05). As a result, administration of 20 IU oxytocin twenty minutes prior to semen collection in bucks did not improve overall semen quality, however, libido, semen volume, and sperm concentrations were increased. In contrast to oxytocin, PGF2α administration has led to a slight decrease in libido and has shown moderate effects on semen quality.

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Luteinizing hormone, testosterone and total estrogens response to exogenous GnRH in crossbred bulls with differing semen quality

Cited by 3 publications

References 25 publications

Responsiveness of prepubertal crossbred bull calves to exogenous GnRH and its impact on reproductive hormones under tropical conditions

Responsiveness of prepubertal crossbred bull calves to exogenous GnRH and its impact on reproductive hormones under tropical conditions

Regulation of postnatal development of testes and its association with puberty and fertility -A review

Oksitosin ve PGF2α Enjeksiyonlarının Teke Sperma Kalitesi Üzerine Etkisi

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